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2. Roller chain - Wikipedia

   en.wikipedia.org/wiki/Roller_chain

   Roller chain and sprocket The sketch of roller chain, Leonardo da Vinci, Codex Atlanticus. Roller chain or bush roller chain is the type of chain drive most commonly used for transmission of mechanical power on many kinds of domestic, industrial and agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, cars, motorcycles, and bicycles.

3. Sprocket - Wikipedia

   en.wikipedia.org/wiki/Sprocket

   16 tooth sprocket. Do = Sprocket diameter. Dp = Pitch diameter A sprocket and roller chain. A sprocket, [1] sprocket-wheel [2] or chainwheel is a profiled wheel with teeth that mesh with a chain, rack or other perforated or indented material. [3] [4] The name 'sprocket' applies generally to any wheel upon which radial projections engage a chain ...

4. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.

5. American wire gauge - Wikipedia

   en.wikipedia.org/wiki/American_wire_gauge

   (E.g. 1 mm diameter wire is ≈18 AWG, 2 mm diameter wire is ≈12 AWG, and 4 mm diameter wire is ≈6 AWG.) This quadruples the cross-sectional area and conductance. A decrease of ten gauge numbers (E.g. from 24 AWG to 14 AWG) multiplies the area, weight, and conductance by approximately 10.

6. Chain drive - Wikipedia

   en.wikipedia.org/wiki/Chain_drive

   Most often, the power is conveyed by a roller chain, known as the drive chain or transmission chain, [1] passing over a sprocket, with the teeth of the gear meshing with the holes in the links of the chain. The gear is turned, and this pulls the chain putting mechanical force into the system.

7. List of gear nomenclature - Wikipedia

   en.wikipedia.org/wiki/List_of_gear_nomenclature

   The outside diameter of a gear is the diameter of the addendum (tip) circle. In a bevel gear it is the diameter of the crown circle. In a throated worm gear it is the maximum diameter of the blank. The term applies to external gears, this is can also be known from major diameter. [1]

8. Birmingham gauge - Wikipedia

   en.wikipedia.org/wiki/Birmingham_gauge

   The Birmingham gauge ranges from 5/0 or 00000, the lowest gauge number corresponding to the largest size of 0.500 inches (12.7 mm), to 36, the highest gauge number corresponding to the smallest size of 0.004 inches (0.10 mm). The increments between gauge sizes are not linear and vary. [2]

9. Film perforations - Wikipedia

   en.wikipedia.org/wiki/Film_perforations

   For 35 mm film these are 0.1866" and 0.1870" (4.740 mm and 4.750 mm); for 16 mm film they are 0.2994" and 0.3000" (7.605 mm and 7.620 mm). This distinction arose because early nitrocellulose film base naturally shrank about 0.3% in processing due to heat, so film printing equipment was designed to account for a size difference between its ...